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FFmpeg/libavcodec/msvideo1enc.c
Andreas Rheinhardt 1d66a122df avcodec/avcodec: Deprecate AV_INPUT_BUFFER_MIN_SIZE 
It used to be used with preallocated packet buffers with
the old encode API, but said API is no more and therefore
there is no reason for this to be public any more.
So deprecate it and use an internal replacement
for the encoders using it as an upper bound for the
size of their headers.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-02-21 00:24:44 +01:00

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/*
* Microsoft Video-1 Encoder
* Copyright (c) 2009 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Microsoft Video-1 encoder
*/
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "bytestream.h"
#include "libavutil/lfg.h"
#include "elbg.h"
#include "libavutil/imgutils.h"
/**
* Encoder context
*/
typedef struct Msvideo1EncContext {
AVCodecContext *avctx;
struct ELBGContext *elbg;
AVLFG rnd;
uint8_t *prev;
int block[16*3];
int block2[16*3];
int codebook[8*3];
int codebook2[8*3];
int output[16*3];
int output2[16*3];
int avg[3];
int bestpos;
int keyint;
} Msvideo1EncContext;
enum MSV1Mode{
MODE_SKIP = 0,
MODE_FILL,
MODE_2COL,
MODE_8COL,
};
#define SKIP_PREFIX 0x8400
#define SKIPS_MAX 0x03FF
#define MKRGB555(in, off) (((in)[off] << 10) | ((in)[(off) + 1] << 5) | ((in)[(off) + 2]))
static const int remap[16] = { 0, 1, 4, 5, 2, 3, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15 };
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
Msvideo1EncContext * const c = avctx->priv_data;
const AVFrame *p = pict;
const uint16_t *src;
uint8_t *prevptr;
uint8_t *dst, *buf;
int keyframe = 0;
int no_skips = 1;
int i, j, k, x, y, ret;
int skips = 0;
int quality = 24;
if ((ret = ff_alloc_packet(avctx, pkt, avctx->width*avctx->height*9 + FF_INPUT_BUFFER_MIN_SIZE)) < 0)
return ret;
dst= buf= pkt->data;
if(!c->prev)
c->prev = av_malloc(avctx->width * 3 * (avctx->height + 3));
if (!c->prev)
return AVERROR(ENOMEM);
prevptr = c->prev + avctx->width * 3 * (FFALIGN(avctx->height, 4) - 1);
src = (const uint16_t*)(p->data[0] + p->linesize[0]*(FFALIGN(avctx->height, 4) - 1));
if(c->keyint >= avctx->keyint_min)
keyframe = 1;
for(y = 0; y < avctx->height; y += 4){
for(x = 0; x < avctx->width; x += 4){
int bestmode = MODE_SKIP;
int bestscore = INT_MAX;
int flags = 0;
int score;
for(j = 0; j < 4; j++){
for(i = 0; i < 4; i++){
uint16_t val = src[x + i - j*p->linesize[0]/2];
for(k = 0; k < 3; k++){
c->block[(i + j*4)*3 + k] =
c->block2[remap[i + j*4]*3 + k] = (val >> (10-k*5)) & 0x1F;
}
}
}
if(!keyframe){
bestscore = 0;
for(j = 0; j < 4; j++){
for(i = 0; i < 4*3; i++){
int t = prevptr[x*3 + i - j*3*avctx->width] - c->block[i + j*4*3];
bestscore += t*t;
}
}
bestscore /= quality;
}
// try to find optimal value to fill whole 4x4 block
score = 0;
ret = avpriv_elbg_do(&c->elbg, c->block, 3, 16, c->avg,
1, 1, c->output, &c->rnd, 0);
if (ret < 0)
return ret;
if(c->avg[0] == 1) // red component = 1 will be written as skip code
c->avg[0] = 0;
for(j = 0; j < 4; j++){
for(i = 0; i < 4; i++){
for(k = 0; k < 3; k++){
int t = c->avg[k] - c->block[(i+j*4)*3+k];
score += t*t;
}
}
}
score /= quality;
score += 2;
if(score < bestscore){
bestscore = score;
bestmode = MODE_FILL;
}
// search for optimal filling of 2-color block
score = 0;
ret = avpriv_elbg_do(&c->elbg, c->block, 3, 16, c->codebook,
2, 1, c->output, &c->rnd, 0);
if (ret < 0)
return ret;
// last output value should be always 1, swap codebooks if needed
if(!c->output[15]){
for(i = 0; i < 3; i++)
FFSWAP(uint8_t, c->codebook[i], c->codebook[i+3]);
for(i = 0; i < 16; i++)
c->output[i] ^= 1;
}
for(j = 0; j < 4; j++){
for(i = 0; i < 4; i++){
for(k = 0; k < 3; k++){
int t = c->codebook[c->output[i+j*4]*3 + k] - c->block[i*3+k+j*4*3];
score += t*t;
}
}
}
score /= quality;
score += 6;
if(score < bestscore){
bestscore = score;
bestmode = MODE_2COL;
}
// search for optimal filling of 2-color 2x2 subblocks
score = 0;
for(i = 0; i < 4; i++){
ret = avpriv_elbg_do(&c->elbg, c->block2 + i * 4 * 3, 3, 4,
c->codebook2 + i * 2 * 3, 2, 1,
c->output2 + i * 4, &c->rnd, 0);
if (ret < 0)
return ret;
}
// last value should be always 1, swap codebooks if needed
if(!c->output2[15]){
for(i = 0; i < 3; i++)
FFSWAP(uint8_t, c->codebook2[i+18], c->codebook2[i+21]);
for(i = 12; i < 16; i++)
c->output2[i] ^= 1;
}
for(j = 0; j < 4; j++){
for(i = 0; i < 4; i++){
for(k = 0; k < 3; k++){
int t = c->codebook2[(c->output2[remap[i+j*4]] + (i&2) + (j&2)*2)*3+k] - c->block[i*3+k + j*4*3];
score += t*t;
}
}
}
score /= quality;
score += 18;
if(score < bestscore){
bestscore = score;
bestmode = MODE_8COL;
}
if(bestmode == MODE_SKIP){
skips++;
no_skips = 0;
}
if((bestmode != MODE_SKIP && skips) || skips == SKIPS_MAX){
bytestream_put_le16(&dst, skips | SKIP_PREFIX);
skips = 0;
}
switch(bestmode){
case MODE_FILL:
bytestream_put_le16(&dst, MKRGB555(c->avg,0) | 0x8000);
for(j = 0; j < 4; j++)
for(i = 0; i < 4; i++)
for(k = 0; k < 3; k++)
prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->avg[k];
break;
case MODE_2COL:
for(j = 0; j < 4; j++){
for(i = 0; i < 4; i++){
flags |= (c->output[i + j*4]^1) << (i + j*4);
for(k = 0; k < 3; k++)
prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->codebook[c->output[i + j*4]*3 + k];
}
}
bytestream_put_le16(&dst, flags);
bytestream_put_le16(&dst, MKRGB555(c->codebook, 0));
bytestream_put_le16(&dst, MKRGB555(c->codebook, 3));
break;
case MODE_8COL:
for(j = 0; j < 4; j++){
for(i = 0; i < 4; i++){
flags |= (c->output2[remap[i + j*4]]^1) << (i + j*4);
for(k = 0; k < 3; k++)
prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->codebook2[(c->output2[remap[i+j*4]] + (i&2) + (j&2)*2)*3 + k];
}
}
bytestream_put_le16(&dst, flags);
bytestream_put_le16(&dst, MKRGB555(c->codebook2, 0) | 0x8000);
for(i = 3; i < 24; i += 3)
bytestream_put_le16(&dst, MKRGB555(c->codebook2, i));
break;
}
}
src -= p->linesize[0] << 1;
prevptr -= avctx->width * 3 * 4;
}
if(skips)
bytestream_put_le16(&dst, skips | SKIP_PREFIX);
//EOF
bytestream_put_byte(&dst, 0);
bytestream_put_byte(&dst, 0);
if(no_skips)
keyframe = 1;
if(keyframe)
c->keyint = 0;
else
c->keyint++;
if (keyframe) pkt->flags |= AV_PKT_FLAG_KEY;
pkt->size = dst - buf;
*got_packet = 1;
return 0;
}
/**
* init encoder
*/
static av_cold int encode_init(AVCodecContext *avctx)
{
Msvideo1EncContext * const c = avctx->priv_data;
c->avctx = avctx;
if (av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
return -1;
}
if((avctx->width&3) || (avctx->height&3)){
av_log(avctx, AV_LOG_ERROR, "width and height must be multiples of 4\n");
return -1;
}
avctx->bits_per_coded_sample = 16;
c->keyint = avctx->keyint_min;
av_lfg_init(&c->rnd, 1);
return 0;
}
/**
* Uninit encoder
*/
static av_cold int encode_end(AVCodecContext *avctx)
{
Msvideo1EncContext * const c = avctx->priv_data;
av_freep(&c->prev);
avpriv_elbg_free(&c->elbg);
return 0;
}
const FFCodec ff_msvideo1_encoder = {
.p.name = "msvideo1",
CODEC_LONG_NAME("Microsoft Video-1"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSVIDEO1,
.p.capabilities = AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
.priv_data_size = sizeof(Msvideo1EncContext),
.init = encode_init,
FF_CODEC_ENCODE_CB(encode_frame),
.close = encode_end,
.p.pix_fmts = (const enum AVPixelFormat[]){AV_PIX_FMT_RGB555, AV_PIX_FMT_NONE},
};
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